public class Example4_5 {
    public static void main (String args[]) {
        Rect ractangle = new Rect();
        ractangle.width=109.87;
        ractangle.height=25.18;
        double area=ractangle.getArea();
        System.out.println("矩形的面积"+area);
        Lader lader=new Lader();
        lader.above=10.798;
        lader.bottom=156.65;
        lader.height=18.12;
        area = lader.getArea();
        System.out.println("梯形的面积"+area);
    }
}
